Samuel golay



i @Intim tats atwt ffice SAMUEL GOLAY, OF KASSE-MILL, NEAR NOYON, SWITZERLAND.

Letters Patent 1Y0. 73,524, dated January 21, 1868.

IMPROVEMENT IN DRESSING IWILIJS'IOIIES.

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TO ALL WHOM IT MAY CONCERN: Y t t v Be it known that I, SAMUEL GOLAY, of lAsse-Mill, near Noyon, Canton of Vaud, Switzerland, have invented a Machine for Dressing Millstones; and I do hereby declare the following to be a full, clear, and exactI description of the same. l

The main feature of my invention consists oi' a cutting-tool, armed with a diamond or other hard stone, and so constructed and operating as to pick or cut grooves in the surface of a millstone, by a series of blows delivered in quick succession, other features of my invention consisting of mechanism, fully described hereafter, for facilitating the adjustment and operation of the said cutter.

In order'to enable others skilled in the art to make and use my invention, I will now proceed to describe its construction and operation, reference being had to the accompanying drawing, which forms a. part of this specification, and in which- A Figure l is an elevation, partly in section, of my machine forrdressing millstones.

Figure 2, a'plan view of the same.

Figure 3, a transverse section of aportion of the machine on the line 1 2lg. 2.

Figure 4, an end view of iig. 3; and

Figures 5, 6, and 7, detached views ot' the cutting-tool.

Similar letters refer to similar parts throughout the several views.

The frame A of the machine consists of a central hub, in which is formed a socket, a, and from which projects a vertical standard, a', and radial arms b, provided at their outer ends with set-screws c, having, at their lower ends, circular plates c', which rest upon the surface of the millstone to be dressed, soy that, by adjusting the set-screws, the position of the frame A, in respect to the stone, may be easily regulated. A frame, B, is pivoted to the frame A, by a set-screw or bolt, d, and may be adjusted laterally on the same, and secured after adjustment by means of a bolt, e, which passes through a. slot, e', in the frame A, the said slo't being inthe arc of circle, of which the bolt d is the centre. A dove-tailed guide-bar, C, is secured to the frame B by bolts or v screws,f, which pass through slots in the frame, so that the bar, although itgenerally occupies the horizontal position shown in fig. l, may be readily adjusted to an inclined position, for a purpose described hereafter. A slide, D, is adapted to the bar C, and this slide carries a plate, F, the movement of which cauonly be at right angles to that of' the slide D, te which a reciprocating motion may be imparted 'by a`bell-crank lever, E, hung to a standard, g, and connected to the said slide D- by a link, gl. The sliding plate F may be operated by a screw-rod, h, ratchet-wheel t', and pawl and lever i', as clearly'shbwn in gs. Sand 4. rIwo levers or toolcarriers, Gr, g. il, are hung to the under side of the sliding plate F, and are secured in the desired position by ,means ot adjusting-screwsj, which pass through projecting portions of the sliding plate, and bear upon the levers, one screw on each side of the pin to which the lever ishung. A'tool-spindle, J, is carried on the points of the screws k ofthe two levers G, but can be readily removed from these screws, and adinsted to the points of. the screws 7c.

The cutting-tool K consists 'of two metal disks, Zand Z', figs. 5 and 6, hung to the spindle J', and confined between a shoulder, m, on the latter, and a nut and washer, n, tig. 7. In each ofthe disks, l and l', are formed recesses, p, of different sizes, the recesses of the two disks forming sockets, each socket holding a, piece of din,A mond, bert, or other hard stone,of a size best adaptedto that of the socket, and in sucha manner that one of the angles or points ofthe stone shall project through an opening at the circumferences of the disks, and beyond the same. The 'tool is caused to revolve by a baud, g, passing from a' pulley, r, which turns upon the standard a of the frame A, and to which motion is communicated b'ya band passing frorua pulley on any adjacent shaft,

and round a pulley, r.

An adjustable arm, s, is secured to the standard a, by a set-screw, t, fig. 1, and at the outer end of this arm is hung a lever, L, which can oscillate freely upon thearm, and has at one end two pulleys, un, over which the band q passes, and at the` other end a counterpoise, v', which continually tends to elevate the pulleys, thus keeping the band tight during all the movements'ot' the slide-plate F and cutting-tool.

Operation.

The machine is placed upon the stone to be dressed, and is levelled by means of the screws c, whicirso regulate its height that the cutter shall approximate to the position which it has to assume when in operation prior to subsequent adjustment bythe se- =crews j, iig. 4. A vertical spindle, or a wooden pivot, P, projecting from the stone, enters the socket a of the frame of the machine, and the latter is properly centred by its set-screws, w, iig. 2. I Motion is communicated to the pulleys i' and 1", and thence, by the band g, to the spindle J and cuttingtool, which is rapidly revolved. Then, by means ofthe lever E, the slide Dis caused to traverse the guide-bar C, and a groove is consequently cut, or rather chipped, in the stone, for the action of the diamond is not of a scraping character, but is similar to thatof the ordinary hand-hammer, as it cracks the stone by blows succeed` ing cach other very rapidly, and causes a picling,'or succession of shocks, which cut up tho stone, and produce the desired e'ect. As soon as a furrow of the desired length has been made in the stone, the slide D is drawn haelt, and the-ratchet z' turned, until the sliding plate F and tool have been moved laterally to a slight extent. The movement ofthe slide is then recomrnonced, and a` second furrow made, andthe operation is continued.

It will he seen on reference to tlg. 2 that the dress of the stone consists of a number of divisions, in which are formed three channels or grooves, and that the channels of 4each division are parallel toeach other, and all communicate with one ofthe channels of the next division. After cutting the iirstchnnnel, as above described, the operation is repented upon the next parallel channel of the same division, until the sliding plate F has reached the end of its course. The machine is then turned, und the guide-bar C again made parallel with the channel by turning the frame B upon its pivot d, after )vhich the sliding lplate F is moved buch to a proper position, and the cutting is recommenced and continuedpuntil all of the channels of the-first division have been cut. The other divisions of the stone are treated in a similar manner, the machine and its several parts boinl properly adjusted for each. .'When it is desired to operate upon the central portion of the stone, the bolts f are loosened, and the guidcbar C slightly inclined, as lbefore described, after which the tool-spindle J is mounted upon the screws c, and properly adjusted.

The pivoting of the supporting-frame B is an important feature of my invention, for without it a much longer movement of the sliding plate F would be required in order to make all of the channels of one division of the dress.

As some stones are furrowefi to the right, and others to the left, the machine is so constructed that the guide-bar C can he secured to either side of that portion of the frame B to which the lboltsfattach it. The position of the slide'can thus be reversed when necessary.

The dressing of millstoucs by hand is an operation requiring a skillful workman, and is necessarily slow and tedious, but by the employment of the above machine, 4which has been practically tested, an inexperienced person'can out aston@ more rapidly, and as well as the most skillful dresser, working with the ordiuar;r hand hammers. v

Although il prefer a rotating disk armed with diamonds or other hard stones, a. goed eiicct may be produced by e. vibrating arm carrying a diamond at the end. A y

Without con'lining myself to the precise construction or arrangement of parts herein described,

I claim as my invention, and desire to secure by Letters Patent- 1. A cutting-tool, armed with a diamond orl diamonds, or other hard stones, and so constructed and operating that while it is caused to traverse, it will cut or chip n. furrow or groove in aV millstone by a succession of blows, as set forth. I

2. The disks Z and l', hung to a spindle, J, and having socketsp of different sizes, in which the cuttingstones are held when the disks are brought together, as described.

3.- The cuttingtool k, constructed substantially `as specified, in .combination with the mechanism herein described, or any equivalent to the same, for imparting to the said tool a. rotary, longitudinal, or lateral motion,

v as and for the purposeherein set forth.

. The adjustable frame A, guided by the central spindle P, and carrying the adjustable plates c', in combination with the pivotedframe B.

5. The reversible guide-har C, so secured to therframe B by bolts'that it may be inclined, for th purpose specified.

In testimony whereof, I have signed my name to this specification in the presence of two subscribing witnesses.

Si GOLAY. Witnesses:

Cms, H. Upros, B. M. 'E'. Urrron. 

